. . "Section Modulus"@en . . "http://en.wikipedia.org/wiki/Section_modulus"^^ . "\\(Z = \\frac{I_a}{(r_Q)_{max}}\\), where \\(I_a\\) is the second axial moment of area and \\((r_Q)_{max}\\) is the maximum radial distance of any point in the surface considered from the \\(Q-axis\\) with respect to which \\(I_a\\) is defined."^^ . . "http://www.iso.org/iso/catalogue_detail?csnumber=31889"^^ . "The Section Modulus is a geometric property for a given cross-section used in the design of beams or flexural members." . "Z" .